I echo the sentiments of paying less. A 450d is plenty decent to learn photography with.
I personally would recommend a used 5d mk2 or mk3 for the benefit of being able to buy full size lenses.
And before you start messing about with cheap nasty zooms get yourself some primes . A good 50mm is an essential inexpensive lens and indeed you may find you use it way more often than any zoom and even a cheap one will be sharper and faster than all but the super expensive zooms.
A 50mm is a must by the sounds of things, you are the 4th person to say that i should get one and they are cheap!
I want to future proof myself so will probably go for a new camera.
thanks.